Contact Us

Blue Cross and Blue Shield of Illinois
300 East Randolph Street
Chicago, Illinois 60601-5099

Make a Payment

Mail your payment to the address on your premium invoice or learn about other convenient ways to pay your bill.

Product and Program Contact Information

If you are a member with a question about your coverage, please contact Customer Service or a specific department listed on this page:

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Individual and Family Plans

If you have coverage through your employer, call the toll-free number on the back of your ID card.

Under 65 New Enrollment

1-866-514-8044

Monday – Friday: 8 a.m. – 8 p.m. CT
Saturday: 8 a.m. – 6 p.m. CT
Sunday: 10 a.m. – 2 p.m. CT

Under 65 Customer Service for Existing Members

1-800-538-8833

Monday – Friday: 7 a.m. – 8 p.m. CT
Saturday: 8 a.m. – 5 p.m. CT
Sunday: Closed

Medicare Supplement New Enrollment

1-800-646-3000

Medicare Supplement Customer Service

1-877-384-9297

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Group Plans

For customer service, call the toll-free number listed on your member ID card.

HMO Illinois®/Blue Advantage HMOSM

HMO: Call the toll-free number listed on your member ID card

HMO Blue USA (away from home urgent care): 1-800-810-BLUE (2583)

PPO

PPO: Call the toll-free number listed on your member ID card

Out-of-Area BlueCard PPO Providers: 1-800-810-BLUE (2583)

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Additional Contact Information

Pharmacy Program

1-800-423-1973

Membership Address

Blue Cross and Blue Shield of Illinois
P.O. Box 3004
Naperville, IL 60566-9747

Claims Address

Blue Cross and Blue Shield of Illinois
P.O. Box 805107
Chicago, IL 60680-4112

Human Resources Inquiries

1-866-977-7378

Supplier Registration

If you are interested in conducting business with Blue Cross and Blue Shield of Illinois, this link takes you to our Supplier Registration Portal.